Benchmarking of USB flash drive

I will appreciate if you can tell me some tools for ubuntu 14.04 LTS, that can measure transfer speed of USB flash drive. I need two or more programs to compare the results and if I can choose the size of the file that would be great.

Use built-in program disks from ubuntu launcher, select your pendrive, click on gear icon, and select benchmark option to run read/write speed test

I know it's a bit old of a post but! You could try the following:

sudo hdparm -Tt /dev/sd

I've used this on multiple occasions with good success. Nice and easy. Not to mention built in.

You could also use the dd command:

dd if=/dev/zero of=./largefile bs=8k count=10000

I'd recommend reviewing the link below though for using the dd command for testing. This is what I've referenced before for testing with dd.

http://www.binarytides.com/linux-test-drive-speed/

It talks about how you have to adjust the bs option depending on the size of the USB you are testing.